Upload
demetrius-porter
View
16
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Characteristics of Life. 1. All Life is Made of Cells. Cells are very small, very organized and covered by a membrane. Cells are the smallest unit of life. 2. All living things reproduce. 3. Metabolism. What do scientists mean by metabolism?. - PowerPoint PPT Presentation
Citation preview
What do scientists mean by metabolism?
• Metabolism is the sum of all chemical reactions carried out in an organism
• Living organisms carry out reactions to obtain and use energy.
What is homeostasis?
• Homeostasis is the ability to maintain stable internal conditions.
What are some examples of this ability in humans?
Examples of Homeostasis
• In humans:– Shivering, sweating, feeling thirst or hunger
• Other animals that live in the cold have fur or a layer of fat to keep warm
• Bacteria that live in toxic environments like high acid lakes can neutralize the acid in their cells
All living things pass on traits to their offspring
• The passing of traits from parents to offspring is called heredity
• A gene is a short section of DNA– A gene is the basic unit of heredity
• A mutation is a change in the DNA of a gene
Evolution occurs in populations not individuals
• Evolution is a change in the inherited characters of a species over time.
• Natural Selection – the process in which organisms with the most favorable traits are more likely to survive and reproduce